<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style>
</head>
<body dir="ltr">
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Hi <span style="caret-color:rgb(0, 0, 0);font-family:"Microsoft Yahei UI", Verdana, Simsun, "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", sans-serif;font-size:14.666666984558105px;background-color:rgb(255, 255, 255);display:inline !important">Aurélien,</span></div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<span style="caret-color:rgb(0, 0, 0);font-family:"Microsoft Yahei UI", Verdana, Simsun, "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", sans-serif;font-size:14.666666984558105px;background-color:rgb(255, 255, 255);display:inline !important"><br>
</span></div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<span style="caret-color:rgb(0, 0, 0);font-family:"Microsoft Yahei UI", Verdana, Simsun, "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, "Helvetica Neue", sans-serif;font-size:14.666666984558105px;background-color:rgb(255, 255, 255);display:inline !important">There
is a rough thought about it: <a href="https://jira.whamcloud.com/browse/LU-13024" id="LPlnk945558">https://jira.whamcloud.com/browse/LU-13024</a></span></div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<span style="color: rgb(23, 43, 77); font-family: -apple-system, system-ui, "Segoe UI", Roboto, Oxygen, Ubuntu, "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif; font-size: 12pt; letter-spacing: -0.24px; orphans: 2; text-align: left; widows: 2; background-color: rgb(255, 255, 255); display: inline !important; line-height: normal;">Lustre
HSM support for a directory</span><br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<span style="color: rgb(23, 43, 77); font-family: -apple-system, system-ui, "Segoe UI", Roboto, Oxygen, Ubuntu, "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif; font-size: 12pt; letter-spacing: -0.24px; orphans: 2; text-align: left; widows: 2; background-color: rgb(255, 255, 255); display: inline !important; line-height: normal;"><br>
</span></div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<span style="color: rgb(23, 43, 77); font-family: -apple-system, system-ui, "Segoe UI", Roboto, Oxygen, Ubuntu, "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif; font-size: 12pt; letter-spacing: -0.24px; orphans: 2; text-align: left; widows: 2; background-color: rgb(255, 255, 255); display: inline !important; line-height: normal;">Regards,</span></div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<span style="color: rgb(23, 43, 77); font-family: -apple-system, system-ui, "Segoe UI", Roboto, Oxygen, Ubuntu, "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif; font-size: 12pt; letter-spacing: -0.24px; orphans: 2; text-align: left; widows: 2; background-color: rgb(255, 255, 255); display: inline !important; line-height: normal;">Qian</span></div>
<div>
<div id="appendonsend"></div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<br>
</div>
<hr tabindex="-1" style="display:inline-block; width:98%">
<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>发件人:</b> lustre-devel <lustre-devel-bounces@lists.lustre.org> 代表 Degremont, Aurelien via lustre-devel <lustre-devel@lists.lustre.org><br>
<b>发送时间:</b> 2021年11月25日 18:18<br>
<b>收件人:</b> lustre-devel@lists.lustre.org <lustre-devel@lists.lustre.org><br>
<b>主题:</b> [lustre-devel] Recommendation for hsm_restore for directories</font>
<div> </div>
</div>
<div class="BodyFragment"><font size="2"><span style="font-size:11pt">
<div class="PlainText">Hello all<br>
<br>
I'm doing some early work toward implementing a directory/namespace support for Lustre/HSM. The idea would be to support something similar to hsm_restore/hsm_release but for directories.<br>
<br>
My first thought was for the MDT to not grant LDLM lock for this directory and hold it, while the directory is getting restored by copytool, in a similar fashion than what is done for files. But the hard part here, is to have a way for copytool to access the
directory while its access is actually prevented by the above locking.<br>
Restoring a file is using this smart trick of restoring it in a different temporary file and using layout swap at the end to move data to the actual real file. It looks difficult to do the same thing here.<br>
<br>
Do you have any recommendation on the right way to frame this directory access for copytools?<br>
<br>
Aurélien<br>
<br>
<br>
_______________________________________________<br>
lustre-devel mailing list<br>
lustre-devel@lists.lustre.org<br>
<a href="http://lists.lustre.org/listinfo.cgi/lustre-devel-lustre.org">http://lists.lustre.org/listinfo.cgi/lustre-devel-lustre.org</a><br>
</div>
</span></font></div>
</div>
</body>
</html>